Growatt Inverter Error Code 405
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Growatt error 405: Relay error
Growatt error code 405 usually means the inverter has detected a relay error. The relay is part of the inverter’s safety and grid connection function, helping control how the inverter connects to and disconnects from the electricity grid.
When this happens, your inverter may stop operating or disconnect from the grid to protect the system.
This is not a normal operating message and should not be ignored if it keeps appearing. A relay error may be linked to an internal inverter hardware fault, software issue, grid condition, inverter settings or another fault affecting the inverter’s grid connection.
Book a solar inverter check with e-Solar
If the code appears once and clears after a restart, your inverter may have recovered from a temporary relay or grid connection issue.
If Growatt error code 405 keeps returning, your solar output has dropped, or the inverter is not operating normally, it is worth having the system checked. Our Perth-based solar team can inspect the inverter, review the fault history and help determine whether the issue is linked to the relay circuit, inverter hardware, inverter settings, grid conditions or another system fault.
Contact e-Solar and let us know:
- The exact error code on the screen or app
- When the code appears
- Whether your solar production has dropped
- Your inverter model, if you know it
Do not open the inverter or attempt electrical testing yourself. If the issue is persistent, a qualified technician may need to assess the relay circuit, inspect the grid connection, review inverter settings and advise whether repair, warranty support or replacement is required.
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Not sure what the error code means? Send us a quick message with a photo of your inverter screen. We’ll help identify the issue and guide you towards the safest next step.
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Growatt Inverter Repairs and Fault Support
We understand that every solar system is different, which is why our repair and fault-finding services cover a wide range of Growatt inverter models. If your inverter is showing error code 405, our experienced technicians can help determine whether the issue is linked to grid voltage, inverter settings, site wiring or wider network conditions.
With over 22 years supporting Perth solar systems, e-Solar has seen all kinds of inverter faults and performance issues. We’ll assess your system safely, explain what the code means, and recommend the right next step to help get your solar running properly again.
Trust e-Solar for reliable Growatt inverter support backed by local experience, honest advice and long-term solar care.